-if you have problems in getting MIDI Thru/Out after installing Cubasis VST4.0, 
you can replace the file MROS32.dll from the Windows/System32-folder with the older CubasisVST3.0-version. 
This is a workaround, which helps on some systems. 
It can be undone by exchanging the files again. 
(keep the downloaded folder somewhere on your harddisc)

